Improvement in filters



UNITED STATES- PATEN'F OFFICE.

JonN GRIFFITH, oF YoNKEns, AND `FREDERICK C. DURANT, CF NEW LYoEK,-N.Y.'

lMPnovl-:MENT IN FILTERS. ,l v`

Spccicction forming partvofLetters PatentNo. 151,610, dated September l,1874; application lled July 3,1814. p Y

To all schont it may concern Be it known that we, JOHN GRIFFITH, ofYonkers, in the county of Westchester and State of New York, andFREDERICK G. DU- RANT, ofthe city, county, and State -of New York,haveinvented a new and useful Improvement in Filters and we do herebydeclare the following to be a full, clear, and exact descriptionthereof, which will enable those skilled in the art 'to make and use thesame, reference being 'had to the accompanying drawing forming part ofthis specification, in which drawing- Figure 1 represents a front viewof this invention.- Fig. 2 is a transverse section .of the same in theplane w Fig. 1. Figs. 4, 5, and 6 show the course of the 'liquid for the-dierent positions ofthe stop-c0cks Similar letters indicatecorresponding parts.

This invention consists in the combination of 'two cocks with aliquid-supply pipe, with pipes leading to and. from a vessel containingthe filtering material, with a waste-pipe, and with a discharge-pipe,one of said cocks being a three-way cock, and the other` "a two-waycock, in such a manner thatby adjusting these cocks the liquid can bemade to pass from the supply-pipe directly to thedischarge-pipe, orthat, when the filtering material is charged with impurities, theseimpurities'can'be washed out by passing the liquid through the filteringmaterial to the waste-pipe, and by these means a filter is obtainedwhich can be used for a long time without requiring a fresh charge of niiltering material.

In the drawing, the letter A designates u vessel made of cast-iron orany other suitable material, and provided. with a sieve, a, near itstop, andwith anothe'r sieve, b, near its bottom. The space between thesetwo sieves is tilled with bone-black, o'r other suitable filteringmaterial, according to the nature of the liquid to be filtered. Saidvessel is, by preference, constructed in two halves, each half be ingprovided with a flange, so the same can be firmly united by means ot'screws c, as shown. From the bottom of the vessel A exteudaa pipe, d,which connects with the shell e of a stop-cock, f. This shell is closedat both ends,

and from one end extends a pipe, g, which passes in'to the'top of thevessel A. The stem of theplng or valve f projects through the oppositeend of said shell, and bears a lever, h, and an index, i. From the sidesof the shell e extend pipes j k in opposite directions the pipe j beingconnectedl to the liquid-supply pipe, while thepipe k leads to thedischargepipe land to the waste-pipe m. The communication between thepipes k, l, and m is controlled by a stop-cock, n, which is soconstructed that by turning it in the proper po- 'sitions the pipe k can be made to communicate either with the discharge-pipe l or with thewaste-pipe m. The stop-cock f is otsuch a form that by turning it in oneposition a direct communication is made between the pipes j and k byturning it in a secondposition, communication is made between the sup#ply-pipe j and the upright pipe d, and also between the tail-pipe vgandthe pipe k,- and by turning said cock iu a third position, communicationis made between the .supply-pipe j and tail-pipe g, and also between theupright pipe d and the pipe k. The two cocksf and 'n are connectedtogetherby arod, o, au levers h p, (see Fig. 1,) so that when the cockfis turned in the first position above named, the

pipe k communicates directly with' the dis-y charge-pipe l, and when thecock f is turned in the second position, the pipe k still communicateswith the discharge-pipe l; but when the cock f is turned to its thirdposition, the pipe k is brought in' communication with the waste-pipe m.

The three positions ofthe stop-cock are marked on the face of the shelleby the words unlte1ed, filtered, and cleansing, and

as the cock is turned the index i points to ,either of these words, andtherebyl shows which position the stop-.cock occupies. When thestop-cock f is turned in its first position, the index i pointing to theword 4 unfiltered, the liquid passes from the suppl pipe j directlythrough the pipe k to the dschargepipe l without entering theilteringwessel. (See Fig. 4.) When this stop-cock occupies its secondposition, Sthe index i pointing to the `word filtered, -)the liquidwhich en ters through the supply-pipe juli-:isses up rthrough theupright pibe d into the filtering-vessel A, through the 'llteningmalterialeontained therein ktothe tail- 'pipe g,jfrom this pipe throughthe awp-cock f and pipe ktothedischerge-pipe l, so' that theimpi'nitieey contained in the liquid will `beretained Iin the filteringmaterial. (See Fig. 5.) When 'the filtering meterialhas become swturated.with impuritie' ,third positongt on the wonicleqnsing The supply-pipe j.'i's'ther'eby brought to communicate. with the the cock f' is turned toits vindex 1T being made to point teil-pipeg; the upright piped with thepipe k, and the pipe L .with the waste-pipe in.. The liquid thereforepasses up through the tailpi'pe',"down through the filtering material,and

ont'throngh the wastepipe m, carrying with itthe impuritiespreviouslydeposited in the lterin'g'fmateriah (See Fig. 6.) After thel-iilteri'ng 'mterial hastlms been cleansed, the

'is tn n'xeiiegaiu to its Second or il- What we claim es new, nml desireto secure by Lettere `liatent, isf- The combination of stop-cocks f andu, consti-noted as describcd, with a ilteringmessel, A, and with pippsj,15d', g', and 1p, Substantially Ain the manner herein set Torth. I

. JOHN GRIFFITH. f F. G. DURANT. Wituesdes z W. BLUFF, I

E. F. Kuri:mamma.`

